2 /************************************************************************
3 * Mailer v0.2.1-FINAL Start: 09/20/2005 *
4 * =================== Last change: 09/20/2005 *
6 * -------------------------------------------------------------------- *
7 * File : security_functions.php *
8 * -------------------------------------------------------------------- *
9 * Short description : Secure all GET, POST and COOKIE data *
10 * -------------------------------------------------------------------- *
11 * Kurzbeschreibung : Alle GET, POST und COOKIE-Daten sichern *
12 * -------------------------------------------------------------------- *
15 * $Tag:: 0.2.1-FINAL $ *
17 * -------------------------------------------------------------------- *
18 * Copyright (c) 2003 - 2009 by Roland Haeder *
19 * Copyright (c) 2009 - 2011 by Mailer Developer Team *
20 * For more information visit: http://mxchange.org *
22 * This program is free software; you can redistribute it and/or modify *
23 * it under the terms of the GNU General Public License as published by *
24 * the Free Software Foundation; either version 2 of the License, or *
25 * (at your option) any later version. *
27 * This program is distributed in the hope that it will be useful, *
28 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
29 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
30 * GNU General Public License for more details. *
32 * You should have received a copy of the GNU General Public License *
33 * along with this program; if not, write to the Free Software *
34 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, *
36 ************************************************************************/
38 // Run only once this security check/replacement
39 if (defined('__SECURITY')) {
43 // Some security stuff...
44 if (strpos($_SERVER['PHP_SELF'], basename(__FILE__)) !== false) {
48 // Include ctracker, recommended place!
49 //require_once('ctracker.php');
52 * Function to secure input strings
54 * @param $str The unsecured string
55 * @param $strip Strip tags
56 * @return $str A (hopefully) secured string against XSS and other bad things
58 function secureString ($str, $strip = true, $encode = false) {
59 // Shall we strip HTML code?
60 if ($strip === true) $str = strip_tags($str);
65 // Encode in entities if requested
66 if ($encode === true) {
67 // Encode in entities (this breakes UTF-8!)
68 $str = htmlentities($str, ENT_QUOTES);
76 * Secures $_SERVER['PHP_SELF'] against attacks
80 function securePhpSelf () {
82 if (isset($GLOBALS['php_self_secured'])) {
83 // Please do not call this twice!
84 die('PHP_SELF is already secured. Please do not call ' . __FUNCTION__ . ' for your self.');
88 $_SERVER['PHP_SELF'] = secureString($_SERVER['PHP_SELF']);
90 // Split it up into path and filename
91 $phpSelfDirectory = dirname($_SERVER['PHP_SELF']);
92 $phpSelfFile = basename($_SERVER['PHP_SELF']);
94 // Check for a .php inside the $phpSelfDirectory...
95 while (strpos($phpSelfDirectory, '.php') !== false) {
96 // Correct the dirname
97 $phpSelfDirectory = substr($phpSelfDirectory, 0, (strpos($phpSelfDirectory, '.php') + 4));
98 // Rewrite filename...
99 $phpSelfFile = basename($phpSelfDirectory);
101 $phpSelfDirectory = dirname($phpSelfDirectory);
104 // Put both together again and let's pray it is secured now...
105 $_SERVER['PHP_SELF'] = $phpSelfDirectory . '/' . $phpSelfFile;
108 $GLOBALS['php_self_secured'] = true;
110 // Remove uneccessary variables
111 unset($phpSelfDirectory);
116 * Detects caching in PHP
120 function detectPhpCaching () {
121 // Activate caching or transparent compressing when it is not already done
122 if (phpversion() >= '4.0.4pl1' && (strstr(getenv('HTTP_USER_AGENT'),'compatible') || (strstr(getenv('HTTP_USER_AGENT'), 'Mozilla')))) {
123 if ((extension_loaded('zlib')) && (function_exists('ob_start'))) {
125 $GLOBALS['php_caching'] = 'on';
128 // Extension not loaded or required function is missing
129 $GLOBALS['php_caching'] = '404';
133 $GLOBALS['php_caching'] = 'old';
137 // Runtime/GPC quoting is off now...
138 ini_set('magic_quotes_runtime', false);
139 ini_set('magic_quotes_gpc', false); // This may not work on some systems
141 // No compatibility with Zend Engine 1, else an error like 'Implicit cloning'
143 if (phpversion() >= '5.0') {
144 ini_set('zend.ze1_compatibility_mode', 'Off');
147 // Check if important arrays are found and define them if missing
148 if (!isset($_SERVER)) {
150 $_SERVER = $GLOBALS['_SERVER'];
155 $_GET = $GLOBALS['_GET'];
158 if (!isset($_POST)) {
160 $_POST = $GLOBALS['_POST'];
163 // Generate arrays which holds the relevante chars to replace
164 $GLOBALS['security_chars'] = array(
165 // The chars we are looking for...
166 'from' => array('/', '.', "'", '$', '(', ')', '{--', '--}', '{?', '?}', '%', ';', '[', ']', ':', '--', "\\"),
167 // ... and we will replace to.
189 // Characters allowed in URLs
191 // Note: Do not replace 'to' with 'from' and vise-versa! When you do this all booked URLs will be
192 // rejected because of the {SLASH}, {DOT} and all below listed items inside the URL.
193 $GLOBALS['url_chars'] = array(
194 // Search for these secured characters
195 'to' => array('{SLASH}', '{DOT}', '{PER}', '{DBL_DOT}', '{COMMENT}'),
196 // Replace with these characters
197 'from' => array('/', '.', '%', ':', '--')
200 // Overworked security part:
201 if (is_array($_GET)) {
202 foreach ($_GET as $seckey => $secvalue) {
203 if (is_array($secvalue)) {
204 // Throw arrays away...
205 unset($_GET[$seckey]);
207 // Only variables are allowed (non-array) but we secure them all!
208 $_GET[$seckey] = str_replace($GLOBALS['security_chars']['from'], $GLOBALS['security_chars']['to'], $_GET[$seckey]);
210 // Strip all other out
211 $_GET[$seckey] = secureString($_GET[$seckey]);
216 // Secure also $_POST data (only simple, no replace)
217 if (is_array($_POST)) {
218 // Secure only simple data
219 foreach ($_POST as $seckey => $secvalue) {
221 if (!is_array($secvalue)) {
222 // Strip all other out
223 $_POST[$seckey] = secureString($_POST[$seckey]);
228 // Detect PHP caching
231 // At last secure the $_SERVER['PHP_SELF'] element
234 // Security system loaded...
235 define('__SECURITY', 1);